SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da3f822e98b247265de2af7670c9ae108757c4dbbc156fee54e323ad8fc93b5' 
  AND token = 'nrmgKHraOhs9jt6vG+wiOakdlp81NsCQBOqzqLNg2BQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}